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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af5c921f8b7ae952b5a3b3d9d15693ff1a10da2d17b4f95ef608a1a48ea34a9d' 
  AND token = 'mlEgaqIxpZg4gUSq92pB6Ae8OCf9k6D0x4286+klbmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}